Lecture23 - 1 Physics 132-Winter 2008 Prof Jim Beatty-Ohio...

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Unformatted text preview: 1 February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 1 Physics 132 Introductory Physics: Electricity and Magnetism Winter Quarter 2008 Lecture 22 February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 2 Magnetism and Electrons Electrons in atoms can be thought of as traveling in orbits with angular momentum. These orbits create loops of current, which result in magnetic moments. Each electron also has an intrinsic magnetic moment due to its spin. In most materials these are randomly oriented and add as vectors to zero. 2 February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 3 Magnetic Materials When an object is placed in a magnetic field, magnetic moments are induced. There are three main possibilities: Diamagnetism : The induced dipole moment is opposite the magnetic field, resulting in a lower field inside than there would be without the material. Paramagnetism : The induced dipole moment is aligned with the magnetic field, resulting in a higher field inside than there would be without the material. Ferromagnetism : The induced dipole moment is aligned with the magnetic field, and some magnetization remains when the field is taken away. February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 4 Diamagnetism A live frog and a ball of water are each levitated above a 16 T solenoid at the University of Nijmegen High Field Magnet Lab....
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This note was uploaded on 04/18/2008 for the course PHYS 132 taught by Professor Beatty during the Winter '08 term at Ohio State.

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Lecture23 - 1 Physics 132-Winter 2008 Prof Jim Beatty-Ohio...

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